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Description:

Ammonia, a widely available compound, exhibits structural transitions from solid to liquid to gas depending on temperature, pressure, and chemical interactions with adjacent atoms, offering valuable insights into planetary science. It serves as a significant hydrogen storage medium in environmental science, mitigating carbon dioxide emissions from fossil fuels. However, its gaseous form, NH3(g), poses health risks, potentially leading to fatalities. The sublimation pressure of solid cubic ammonia, NH3(cr), below 195.5 K is minimal. In this study, we endeavoured to stabilise NH3(cr) at room temperature for the first time. Through confinement within a boric acid glass matrix, we successfully synthesised and stabilised cubic crystal NH3(cr) with a lattice constant of 0.5165 nm under atmospheric pressure. Thermodynamic simulations affirmed the stabilisation of NH3(cr), indicating its quasi-equilibrium state based on the estimated standard Gibbs energy of formation of NH3(cr) at 298.15 K. Despite these advancements, the extraction of H2(g) from NH3(cr) within the boric acid glass matrix remains unresolved. The quest for an external matrix with catalytic capabilities to decompose inner NH3(cr) into H2(g) and N2(g) presents a promising avenue for future research. Achieving stability of the low-temperature phase at ambient conditions could significantly propel exploration in this field.

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• https://creativecommons.org/licenses/by/3.0/legalcode
  

Keyword: solid state ammonia, confined in a glass substance, stabilisation at ambient temperature , hydrogen storage substance , safety storage and transport of ammonia

Date published: 2024-05-20

Publisher: Royal Society of Chemistry (RSC)

Journal:

• RSC Advances (ISSN: 20462069) vol. 14 issue. 23 p. 16128-16137

Funding:

• Japan Society for the Promotion of Science 24K08127
• Hyogo Science and Technology Association Academic research grant
• University of Hyogo Special research grant for hydrogen energy

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1039/d4ra00229f

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Updated at: 2025-02-04 16:30:21 +0900

Published on MDR: 2025-02-04 16:30:22 +0900